Supercritical carbon dioxide was employed to extract wheat plumule oil in this study. Effects of pressure, temperature, CO 2 solvent flows and extraction time on the extraction efficiency were investigated. Three models were set up to describe extraction yield-pressure-temperature, extraction yield-pressure-solvent flows and extraction yield-pressure-extraction time relationships, respectively. A good agreement between predicted values and experimental values was found. By models the optimum processing conditions and quasi-equilibrium conditions of extraction systems can be determined. It contributes to the design and scale-up of process.